Java regex split String into an array of numbers

Question

I have a scanner String input in the following format: 12:00:00PM.

I managed to finally isolate PM or AM by this:

public class ConverTime
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String timeString = sc.next();

        String[] pmOrAm = timeString.split("\\d");
        String[] nums = timeString.split("(: + \\D)");

        // PM or AM
        String timeType = pmOrAm[pmOrAm.length - 1];
        for (String n: nums)
        {
            System.out.println(n);
        }
    }
}

I know the way I isolate PM or AM is not the best, so hopefully there is a better way where i can get an array of exactly one string.

But when I run the for loop for the "nums" array, the output is:

 12:00:00PM

I want the output to be like so:

12
00
00

without the "PM" or "AM." How do I go about this?

Florian Schaetz · Accepted Answer · 2016-08-28 20:15:35Z

3

Just for completeness sake, while there have been good solutions for split and regular expressions, there is another one for your use case...

Data date = new SimpleDateFormat("HH:mm:ssaa").parse(s);
Calendar cal = new GregorianCalendar();
cal.setTime(date);
System.out.println( data.get(Calendar.HOUR);
System.out.println( data.get(Calendar.MINUTE);
System.out.println( data.get(Calendar.SECOND);

Just as an idea in a different direction, since we are talking about time Strings here, which would allow you to make assumptions about it beyond the pure regular expression format...

answered Aug 28, 2016 at 20:15

Florian Schaetz

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Comments

frankfg · Accepted Answer · 2016-08-28 20:10:10Z

2

an easy way could be:

timeString.split("(AM|PM|:)")

Hope it helps

edited Aug 28, 2016 at 20:10

answered Aug 28, 2016 at 20:03

frankfg

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2 Comments

Struggling Over a year ago

This worked! Thanks! Although I was looking to do it purely use the split method, this is working too!

Struggling Over a year ago

Thank you, that is even much simpler!! I upvoted you but my upvote won't count yet.

Jan · Accepted Answer · 2016-08-28 19:59:52Z

2

Like this:

(\d+):(\d+):(\d+)(?:[AP]M)

See a demo on regex101.com.
Remember to double escape the backslashes in Java (ie \\d+).

answered Aug 28, 2016 at 19:59

Jan

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2 Comments

Struggling Over a year ago

Are you sure? This out puts nothing on the screen now. I did the following: String[] nums = timeString.split("(\d+):(\d+):(\d+)(?:[AP]M)");

Jan Over a year ago

@NishaShlaymoon: with .split(), you can even use the colon.

jacky · Accepted Answer · 2016-08-28 20:07:32Z

1

you just have to use String[] nums = timeString.split(":"); and to output each index it would be something like System.out.println(nums[0]); , nums[1] and nums[2] and to remove AM/PM you can do String removeap = nums[2].substring(0, 2);

edited Aug 28, 2016 at 20:07

answered Aug 28, 2016 at 20:02

jacky

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Comments

Ashwinee K Jha · Accepted Answer · 2016-08-28 20:12:19Z

1

I think more correct way is to use regular expression here rather than split. This way you can detect if you get unexpected inputs rather than having the string processed incorrectly.

    String s = "12:01:02PM";
    Pattern pat = Pattern.compile("(\\d\\d):(\\d\\d):(\\d\\d)\\w\\w");
    Matcher matcher = pat.matcher(s);

    if (!matcher.matches()) {
        // Handle error...
    }

    int hh = Integer.valueOf(matcher.group(1));
    int mm = Integer.valueOf(matcher.group(2));
    int ss = Integer.valueOf(matcher.group(3));

    System.out.println(hh + ", " + mm + ", " + ss);

answered Aug 28, 2016 at 20:12

Ashwinee K Jha

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